1. By moving the radar beam around slowly in circles, we can _____ the surroundings.
A. explore B. expose C. exploit D. addle

<addle>
addle 混乱的、糊涂的
addle egg 变坏了的蛋
</addle>

<explore>
explore 开发、研究、探索
</explore>

<expose>
expose 暴露
</expose>

<exploit>
exploit 开发、剥削
explode 爆炸
lodestar 北极星
the exploited 被剥削者
</exploit>